Microsoft releases MS-DOS 4 source code on GitHub — 45 year old code now open-source

Microsoft has released the MS-DOS 4.00 source code, binaries, disk images, and documentation. The source code, which is nearly 45 years old, has been released under the MIT license, allowing tinkerers free rein. 

Microsoft has released the MS-DOS 4.00 source code, binaries, disk images, and documentation. The source code, which is nearly 45 years old, has been released under the MIT license, allowing tinkerers free rein.